Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1996-01-15
Nucl.Phys. B474 (1996) 481-496
Physics
High Energy Physics
High Energy Physics - Phenomenology
15 pages, LaTeX (no figures), available through anonymous ftp as LaTeX from ftp://euclid.tp.ph.ic.ac.uk/papers/95-6_18.tex or
Scientific paper
10.1016/0550-3213(96)00286-6
We consider Wick's Theorem for finite temperature and finite volume systems. Working at an operator level with a path ordered approach, we show that contrary to claims in the literature, expectation values of normal ordered products can be chosen to be zero and that results obtained are independent of volume. Thus the path integral and operator approaches to finite temperature and finite volume quantum field theories are indeed seen to be identical. The conditions under which normal ordered products have simple symmetry properties are also considered.
Evans T. S.
Steer Daniele A.
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